Page 81 - Pipelines and Risers

54 Chapter 3

The equation is valid for the following range of hoop stress and axial force:
-- l a 1
hz&xiT
(3.50)

Case 3 - Corroded area in tension
Final expression for case 3:

M, = Zrr:u,, (3.51)

(3.52)

2- [ :I ;.I
[ :)[ 21f,)
k,=l- 1-- 1+- k -1- 1-- 1+-

The equation is valid for the following range of hoop stress and axial force:
--<o,<L
1
- O0.h -
and

(3.53)

Case 4 - Corroded area in tension and some in compression
Final expression for case 4:

(3.54)

(3.55)